TSingleton.h

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#pragma once
#include <type_traits>
 
TOSHI_NAMESPACE_START
 
template <typename T>
class TSingleton
{
public:
    TSingleton( const TSingleton& )             = delete;
    TSingleton( const TSingleton&& )            = delete;
    TSingleton& operator=( const TSingleton& )  = delete;
    TSingleton& operator=( const TSingleton&& ) = delete;
 
    // Creates Singleton instance and returns it
    template <typename... Args>
    TFORCEINLINE static T* CreateSingleton( Args&&... args )
    {
        return new T( std::forward<Args>( args )... );
    }
 
    // Creates Singleton instance for a derived class and returns it
    template <typename D, typename... Args>
    TFORCEINLINE static D* CreateSingleton( Args&&... args )
    {
        TSTATICASSERT( std::is_base_of_v<T, D> == TTRUE );
        return new D( std::forward<Args>( args )... );
    }
 
    TFORCEINLINE static void DestroySingleton()
    {
        delete GetSingletonSafe();
        ms_pSingleton = TNULL;
    }
 
    // Returns pointer and asserts if it's not allocated
    TFORCEINLINE static T* GetSingletonSafe()
    {
        TASSERT( ms_pSingleton != TNULL, "Singleton instance is not created" );
        return ms_pSingleton;
    }
 
    TFORCEINLINE static TBOOL IsSingletonCreated()
    {
        return ms_pSingleton != TNULL;
    }
 
    // Returns pointer even if it's not allocated
    TFORCEINLINE static T* GetSingleton()
    {
        return ms_pSingleton;
    }
 
#if defined( TOSHI_MODLOADER ) || defined( TOSHI_MODLOADER_CLIENT )
    TFORCEINLINE static T* SetSingletonExplicit( T* a_pPtr )
    {
        ms_pSingleton = a_pPtr;
        return ms_pSingleton;
    }
#endif
 
protected:
    TFORCEINLINE TSingleton()
    {
        TASSERT( ms_pSingleton == TNULL, "Singleton instance is already created" );
        ms_pSingleton = static_cast<T*>( this );
    }
 
    TFORCEINLINE ~TSingleton() { ms_pSingleton = TNULL; }
 
    static T* ms_pSingleton;
};
 
template <typename T>
T* TSingleton<T>::ms_pSingleton = TNULL;
 
TOSHI_NAMESPACE_END